I have a peacock cichlid with red gills. He isn't eating and does a strange gulping motion periodically. The tank was fully cycled before the 9 juvenile cichlids were added in early December. No new fish or plants have been introduced. The only change I made prior to his symptoms was rinsing 1 filter (I have 2 canisters on this tank), removing the carbon that came with it, and adding crushed coral to the filter. When I checked the water after his gills turned red, the ammonia was at 0.25. I did a 25% water change and treated with prime. Ph is up to 8 from 7.5 before (b/c the coral). Everything else measured the same as usual. 0 nitrates and 0 nitrites. Ammonia is down to 0 now. It has been 36 hrs since the water change, there doesn't seem to be any improvement in my fish. The other 8 fish show no signs of trouble whatsoever. Thoughts on what could be wrong and what I should do?
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